Tread member for antiskidding devices



May 1927' A. R. THOMSON TREAD MEMBER FOR ANTISKIDDING DEVICES Filed March 26. 1925 Patented May 17, 1927.

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ALBEBT 'TH MS Q DERBY, Ceaaeerxeve emp ivinivinnn non ANrrrsxinnmG Devious;

Application filed March as, 1925.. Serial No. 18,413.

My inventionrelates to improvements in tread members for ant1-sk1d dipg devices or the general ,form that is shown and deseribei l,

in my application filed June, 29,f1923,' Serial No. 6f18,58l-,and the objectofmy improve ment here set forth has reference specifically to the construction and arrangement of certain elementsthat are adaptedto be used inftread members and contain in the constructive details a" single strand of wire that has a return bend, thusproviding two strands that are opposed one to ,the other and posit-ioned side by Side, said strands being preferably twisted and said strands, also, being spaced from one another iorthe double purpose of producing ayi'elding or: spring efiect under confilltlQnsjolt useiandoi permitting of freely assembling and disassembling, the'free ends of said strands being bent andshaped to provide some iorin or-hook structure for connection with sup porting devices. I T

' In, the accompanying drawing Figure l is a plan View of a tread, member embodyingmy invention, corresponding to one form that is shown in the application. re. i'erred to, the connecting hooks .fOli'BifCCtr ing connection with the side chains being shown by brokenlines? 7 Figure 2 is a side elevation of the same, the connecting hook at the free ends of the strands being omitted, and a hook for connection with the loop at the return bend being shown at an intermediate position along I the opposed strands.

v Figure 3 is a side elevation oia tread the ment that difiers from the form that is shown in Figs. 1 and-2 in that there is .no bendin the structure along the axial line.

Figure 4 corresponds to Fig. 5 of the'application mentioned, showing a two-part.

form of construction and involving essentially an adaptation.ormodification oi the structure that is shown and described in the patent issued 'to Napoleon Rinfrett, March 7, 1917, No. 1,217,999. r

Figure 5 is a side elevation of a tread element of extended dual form for use with automobile wheel structures of double form andjin which the active elements are longitudinally spaced andconnected by "means of a link or the like the individual elements being longitudinally curved.

Figure 6 is a side elevation and on a re-s duced scale of a tread member of dual form the connecting hook pressed apart.

and with the endconnecting hooks and Wh ch-has thein lividual clcilients of straight form and a connectinglink of elongated-noucircular form; V ,My ,i mprovedl tread; member, for an ti-skidding devices involves the .uselo ii a i'active member 10 thatin particular embodiesmy inyention and that issconnected by iltsqends through the medium of end or connecting hooks'll of substantially ordinary forinto side chains ofthe usual form. 1 1 Said active member 10 is formed ofa single piece lof'wire that'is bent back upon itself at or adjacentthe iniddle toprovide aloop 12 that is adapted .to receive and'co-f operate with one of the connectiughooks 11 I for eficcting'the end connection atcthis par-. ticular end; I 7 i '7 Forconnecting with the hook .11 at the other end the :free ends'ofthe strands may form that is operative and convenient may] be provided. 7

the structure that isshown in Figsgl and2-thetwo strand ends 13 are individually formed into hooks, the two hooks being positionedside by side and turned oppositely, in, a manner that is well known.

' The two opposed books 13 when connected to a connecting hook 11 in the usual manner by being entered through the loop portion 1a thereofwill be pressed together so as to be in contact,iside by side.

As to therelative position of said hooks 13 when the device is free from strain or contact with other parts, this will depend upon the'particular setting that is provided there for in that they may be normally spacedone from the other or may be in contact, aspring or yielding effect being involved. in either case,

In the preferred form said hooks" 13 are normally in contactyside' by side, and to effect connection withthe loop portion'l of 11 they can be forcibly J The individual strands 15 intermediate loop 12 atoneend and the hooks 13 at the other end are of proper length to serve as, active road-contacting elements; are twisted around one another; and are normally spaced apart, the separating space being generally such as to admit relatively freely the connecting hook 13 that is to be connected with the closed end or loop 12.

The active member 10, as mentioned, is made of wire and of spring material.

In the structure that is shown in Figs. 1 and 2 said active member 10 is curved from end to end to correspond generally tothe curvature of the face of the tire to which it is applied. Thus inliig. 2 the middle portion 17 is higher than the end portions 12 and 13.

In the form that is shown in Fig. 3 the active member 1O has an axial line that is essentially straight and adapted to extend across the active portion of the face of a tire that is essentially flat. In this case the connecting hooks 15 would meet the ter minals 1'2 and 13v at a more pronounced angle in making connection with the side chains and they may be made somewhat longer than hooks of the usual form.

In the structure that is shown in Fi g. ithe active tread structure is made up of two similar and relatively short tread elements devices for the spaced tires of a dual wheel structure.

In the dili'erent devices shown the connection with the loop or return bend can be made by spreading apart the hooks at the tree ends of the strands; entering the device to be connected between said hooks;

and finally slipping said device along the space between the strands to reach the loop or return bend.

Reverting to the town that is shown in Fig. 5, the individual tread elements 10 differ from the elements 10" that are shown in Fig. 4; only in the manner of use, said elements being of longitudinally curved lorm.

In tliestructure that is-shown in Fig. 6 v

the individual tread members or elements 10 are straight and theconnecting link 18 is'o't elongated or oval form instead of circular, as in Fig. 5. The hooks ll of the form that is shown in Fig. 6 aswell as the hooks 11 of Fig. 3" would be somewhat;

longer thani or the form that is shown in.

liigs. 1 and 2. I

I claim as my 1nvent1on: 7 1-111 active tread member for an anti-skidding devicemade-ot a single pieceof 'wire. that is bent adjacent the middle to, providean open loop anda pair of strands-connected to the arms of saidloop, the free ends of structure, the said strands being positioned sideloy side and twisted, said strands being normally separated one from the other by an open space and the aXis'of said strands being substantially straight.

ALBERT R. THOMSON;

-7.0 7 said strands being swaged to provide a hook 

